Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 223 · 40 questions

Remember (Measure it, then move it): Match the sensor to the quantity: light, heat, distance, movement, soil wetness, sound, gas or rain. Match the actuator to the action: spin (motor), exact angle (servo), beep (buzzer), light (LED), water (pump), numbers (display). Echo distance = 17 × echo time in ms (cm), because the sound goes there and back.

1. 1.Which job needs a soil moisture sensor? (a) spot someone walking in (b) water a dry plant (c) switch on lamps at dusk (d) start a fan when hot
2. 2.⚙️ Which actuator would you use to turn to an exact angle? (a) an LED (b) a pump (c) a display (d) a servo motor
3. 3.Which job needs a gas sensor? (a) spot someone walking in (b) warn of a gas leak (c) start a fan when hot (d) water a dry plant
4. 4.Which job needs a temperature sensor? (a) warn of a gas leak (b) measure classroom noise (c) open blinds at sunrise (d) keep an incubator warm
5. 5.True or false: to switch on with a clap, use a sound sensor. (a) True (b) False
6. 6.Which job needs a pump? (a) turn to an exact angle (b) show a status light (c) move water to plants (d) beep an alarm
7. 7.🔍 An object is 85 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
8. 8.Which job needs a sound sensor? (a) measure classroom noise (b) start a fan when hot (c) spot someone walking in (d) make a parking alarm
9. 9.Which job needs a sound sensor? (a) start a fan when hot (b) switch on lamps at dusk (c) warn of a gas leak (d) switch on with a clap
10. 10.🔍 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
11. 11.🔍 Which sensor would you use to measure classroom noise? (a) a temperature sensor (b) a soil moisture sensor (c) a sound sensor (d) a distance sensor
12. 12.⚙️ What is an actuator? (a) a sensor (b) an output that acts (c) a battery (d) a program
13. 13.🔍 Which sensor would you use to warn of a gas leak? (a) a rain sensor (b) a sound sensor (c) a light sensor (d) a gas sensor
14. 14.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) an output (c) a power source (d) a fuse
15. 15.🔍 A distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
16. 16.🔍 An object is 17 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
17. 17.🔍 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
18. 18.🔍 Which sensor would you use to keep an incubator warm? (a) a light sensor (b) a sound sensor (c) a distance sensor (d) a temperature sensor
19. 19.⚙️ Which actuator would you use to show a status light? (a) a buzzer (b) a servo motor (c) a pump (d) an LED
20. 20.Which job needs a buzzer? (a) open a gate to 90° (b) turn to an exact angle (c) spin a robot’s wheels (d) beep an alarm
21. 21.Which job needs a light sensor? (a) switch on lamps at dusk (b) water a dry plant (c) spot someone walking in (d) close a window in rain
22. 22.🔍 Which sensor would you use to open blinds at sunrise? (a) a light sensor (b) a gas sensor (c) a temperature sensor (d) a distance sensor
23. 23.Which job needs a distance sensor? (a) switch on with a clap (b) close a window in rain (c) stop a robot near walls (d) switch on lamps at dusk
24. 24.⚙️ Which actuator would you use to beep an alarm? (a) a pump (b) an LED (c) a motor (d) a buzzer
25. 25.Which job needs a servo motor? (a) open a gate to 90° (b) show a status light (c) beep an alarm (d) move water to plants
26. 26.🔍 An object is 238 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
27. 27.⚙️ Which actuator would you use to show the temperature? (a) a motor (b) a display (c) a pump (d) a servo motor
28. 28.🔍 An object is 306 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
29. 29.⚙️ Which actuator would you use to open a gate to 90°? (a) a buzzer (b) an LED (c) a motor (d) a servo motor
30. 30.Which job needs an LED? (a) turn to an exact angle (b) show a status light (c) open a gate to 90° (d) show the temperature
31. 31.🔍 Which sensor would you use to spot someone walking in? (a) a rain sensor (b) a motion sensor (c) a gas sensor (d) a temperature sensor
32. 32.True or false: to close a window in rain, use a soil moisture sensor. (a) True (b) False
33. 33.🔍 Which sensor would you use to water a dry plant? (a) a light sensor (b) a sound sensor (c) a soil moisture sensor (d) a temperature sensor
34. 34.Which job needs a motor? (a) show the temperature (b) open a gate to 90° (c) spin a robot’s wheels (d) show a status light
35. 35.True or false: to make a parking alarm, use a distance sensor. (a) False (b) True
36. 36.Which job needs a temperature sensor? (a) start a fan when hot (b) switch on with a clap (c) water a dry plant (d) measure classroom noise
37. 37.🔍 Which sensor would you use to close a window in rain? (a) a distance sensor (b) a temperature sensor (c) a sound sensor (d) a rain sensor
38. 38.🔍 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
39. 39.🔍 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
40. 40.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False

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